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Machine translation
1. (WO1981000456) METHOD AND DEVICE FOR MEASURING DISTANCES
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1981/000456    International Application No.:    PCT/AU1980/000040
Publication Date: 19.02.1981 International Filing Date: 30.07.1980
IPC:
G01S 15/10 (2006.01)
Applicants:
Inventors:
Priority Data:
9774/79 30.07.1979 AU
Title (EN) METHOD AND DEVICE FOR MEASURING DISTANCES
(FR) PROCEDE ET DISPOSITIF DE MESURE DE DISTANCE
Abstract: front page image
(EN)A device for measuring distances which is one embodiment will allow an echo of a transmitted acoustic signal to be identified in a noisy environment and in second embodiment is more suited for less noisy environments. The device comprises a phased locked loop circuit (5, 6, 1, 2) which provides a reasonant frequency to a transducer (4) to result in a frequency modulated tone burst being transmitted. A received signal is cross-correlated by storing samples of the transmitted signal in a first storage location (10) and samples of the received signal in a second storage location (40). The samples are compared by EXCLUSIVE OR gate (120) to determine if there is correlation between the received signal and transmitted signal. The number of correlations are counted in counter (130) and the number is displayed as a peak or an A scan. The larger the peak the greater the correlation. Hence when a large peak is displayed there is indication of receipt of the echo and the time between transmission and receipt may be read from the time base of the A scan and the distance calculated. In a second embodiment filter (74) is synchronised with a constant transmitted tone burst so that a received echo will charge capacitors C1...Cn in the same manner during each cycle of the received echo indicating receipt of the echo. The received signal is then applied to an A scan in a similar manner to that described above so that large peaks will be indicative of receipt of the echo and time between transmission and receipt may be used to calculate the distance between the object and the receiving location.
(FR)Un dispositif de mesure de distance permet, dans un mode de realisation, d"identifier un echo d"un signal acoustique transmis dans un environnement brayant et, dans un second mode de realisation, est adapte davantage aux environnements moins bruyants. Le dispositif comprend un circuit de boucles fermees de phase (5, 6, 1, 2) qui envoient une frequence resonnante a un transducteur (4) qui resulte dans la transmission d"un train de signaux comptant pour une unite de tonalite de frequence modulee. Un signal recu subit une correlation croisee en stockant des echantillons du signal transmis dans une premiere adresse de memoire (10) et des echantillons du signal recu dans une seconde adresse de memoire (40). Les echantillons sont compares par une porte OU EXCLUSIF (120) pour determiner s"il y a correlation entre le signal recu et le signal transmis. Le nombre de correlations est compte dans un compteur (130) et le nombre est affiche sous forme de crete ou d"exploration A. Plus la crete est grande plus la correlation est grande. Par consequent, lorsqu"une grande crete est affichee, c"est une indication de la reception de l"echo et le temps ecoule entre la transmission et la reception peut etre lu a partir de la base de temps de l"exploration A et de la distance calculee. Dans un second mode de realisation un filtre (74) est synchronise avec un train de signaux comptant pour une unite de tonalite a transmission constante de sorte qu"un echo recu charge des condensateurs C1...Cn de la meme maniere pendant chaque cycle de l"echo recu indiquant la reception de l"echo. Le signal recu est ensuite applique a une exploration A de la meme maniere que celle decrite ci-dessus de sorte que de grandes cretes seront une indication de la reception de l"echo et le temps ecoule entre la transmission et la reception peut etre utilise pour calculer la distance entre l"objet et le point de reception.
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)